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The CaSSIS imaging system: optical performance overview

机译：CaSSIS成像系统：光学性能概述

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The Colour and Stereo Surface Imaging System (CaSSIS) is the high-resolution scientific imager on board the European Space Agency's (ESA) ExoMars Trace Gas Orbiter (TGO) which was launched on 14th March 2016 to Mars. CaSSIS will observe the Martian surface from an altitude of 400 km with an optical system based on a modified TMA telescope (Three Mirrors Anastigmatic configuration) with a 4th powered folding mirror. The camera EPD (Entrance Pupil Diameter) is 135 mm, and the expected focal length is 880 mm, giving an F# 6.5 in the wavelength range of 400- 1100 nm with a distortion designed to be less than 2%. CaSSIS will operate in a "push-frame" mode with a monolithic Filter Strip Assembly (FSA) produced by Optics Balzers Jena GmbH selecting 4 colour bands and integrated on the focal plane by Leonardo-Finmeccanica SpA (under TAS-I responsibility). The detector is a spare of the Simbio-Sys detector of the Italian Space Agency (ASI), developed by Raytheon Vision Systems. It is a 2k×2k hybrid Si-PIN array with a 10μm pixel pitch. A scale of 4.6 m/px from the nominal orbit is foreseen to produce frames of 9.4 km × 47 km on the Martian surface. The University of Bern was in charge of the full instrument integration as well as the characterization of the focal plane and calibration of the entire instrument. The paper will present an overview of the CaSSIS telescope and FPA optical performance. The preliminary results of on-ground calibration and the first commissioning campaign (April 2016) will be described.
机译：彩色和立体表面成像系统（CaSSIS）是欧洲航天局（ESA）于2016年3月14日发射到火星的ExoMars微量气体轨道仪（TGO）上的高分辨率科学成像仪。 CaSSIS将使用基于光学系统的400英尺高空观测火星表面，该光学系统基于改进的TMA望远镜（三面镜无视配置），并带有第4台电动折叠镜。相机的EPD（瞳孔直径）为135 mm，预期的焦距为880 mm，在400-1100 nm的波长范围内提供F＃6.5，且失真度设计为小于2％。 CaSSIS将与由Optics Balzers Jena GmbH生产的整体式滤光片组件（FSA）在“推框式”模式下运行，该滤光片组件选择4个色带，并由Leonardo-Finmeccanica SpA集成在焦平面上（由TAS-I负责）。该探测器是雷神视觉系统公司开发的意大利航天局（ASI）的Simbio-Sys探测器的备用产品。它是一个2k×2k混合Si-PIN阵列，像素间距为10μm。预计从名义轨道开始的比例为4.6 m / px，在火星表面上将产生9.4 km×47 km的帧。伯尔尼大学负责整个仪器的集成以及焦平面的表征和整个仪器的校准。本文将概述CaSSIS望远镜和FPA光学性能。将描述地面校准和首次调试活动（2016年4月）的初步结果。

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